[CentOS] vpn client setup/plugin

I'm trying to find the correct vpn plugin so I can vpn in to a server.  The
server requirements are vpn server, username/password and shared secret.
 I've installed a few vpn plugins, but I haven't found the correct one that
has the shared secret option. Anyone know which one it is?  I've tried a
few from the Add/Remove Software application.

Thanks,

-wes